Cmdpal: Fix the path error to pack the sdk (#44390)

<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
1. Fix the path change introduced by #44316 when buildsdk standalone
2. Add a build step in CI to make sure sdk build correctly in future
changes

<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist

- [ ] Closes: #xxx
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
Pipeline should pack sdk correctly
<img width="329" height="119" alt="image"
src="https://github.com/user-attachments/assets/5f223d82-5213-4735-9b14-1ddad9ec41a2"
/>

.pipelines/v2/templates/pipeline-ci-build.yml

@@ -63,3 +63,20 @@ stages:
               winAppSDKVersionNumber: ${{ parameters.winAppSDKVersionNumber }}
               useExperimentalVersion: ${{ parameters.useExperimentalVersion }}
             timeoutInMinutes: 90
+
+  - stage: Build_SDK
+    displayName: Build Command Palette Toolkit SDK
+    dependsOn: []
+    jobs:
+      - template: job-build-sdk.yml
+        parameters:
+          pool:
+            ${{ if eq(variables['System.CollectionId'], 'cb55739e-4afe-46a3-970f-1b49d8ee7564') }}:
+              name: SHINE-INT-L
+            ${{ else }}:
+              name: SHINE-OSS-L
+            ${{ if eq(parameters.useVSPreview, true) }}:
+              demands: ImageOverride -equals SHINE-VS17-Preview
+          buildConfigurations: [Release]
+          official: false
+          codeSign: false